A few websites, most notably Windows Update, are Internet Explorer-only, but for those you can still use Internet Explorer or download the IE Tab extension for Firefox. Otherwise Firefox 3.x is the way to go (Firefox 2.x is being retired in December) and remember you can always switch back to Internet Explorer or launch it at any time.
I just reinstalled windows vista and am now installing programs and was wondering whether to stick with ie 7 or firefox - I hear tha tfirefox is great but do all websites work on it? and if i switch - which version of firefox should i get?
Thanks for any info!